2 Answers
2

Live's tempo can be mapped to MIDI CCs in two parts: coarse and fine. You can map one CC to coarse, and one to fine, so your coarse setting can have 128 steps of resolution, and between each of those, you can set a further 128 steps with the other CC. When you enter MIDI-mapping mode (cmd+M), you can see that the global tempo has two mappable areas.

To further increase your precision, you can open Live's browser during MIDI mapping and specify the maximum and minimum tempo range that your 128 steps will represent. If you never plan to go below, say, 60bpm or above 200, then you can specify these as the endpoints, and now your CC steps are just under 2bpm apart instead of 5. The narrower you go, the finer the resolution.

This also generically works for any parameter you map using the mapping interface.

I still had trouble with accuracy, but I definitely think this is the route to go if people are interested in doing this. The option I settled for was constantly baging the Tap Tempo button from Max. Pretty inaccurate but fun! Thanks @WarriorBob
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rob-gordonApr 24 '13 at 21:40